srowen commented on issue #25785: [SPARK-27812][CORE] Explicit System.exit after job's main URL: https://github.com/apache/spark/pull/25785#issuecomment-531484404 Wait, shutdown hooks definitely run when the JVM terminates, unless it is forcibly killed or crashes. I am not sure this is the issue. You don't want to remove a call to stop(); it is necessary. If your app creates non-daemon threads, it has to ensure they terminate or else indeed any Java application won't stop after main() exits in that case.
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